Cozy but big room in a small Thai house. The pool is in the shadow, like in all Bangkok house but makes it very refreshing. There is a kitchen for common use with free coffee,tea, water etc. The area itself, is full of hip restaurants, bars and nightlife. So perfect location for spending some time in Bangkok like a local / expat. Also BTS Thonglo is walking distance AND the taxi boat that brings you straight to the (touristic) Center is also walking distance, just the other direction than the BTS.
My host gave me a free laundry service while I stayed there and recommended many nice places to eat as well as how to get there. The only small inconvenient of the place is that, despite being on a side street, you can hear motorbikes speeding through the small streets.. make sure to have earplugs if you are a light sleeper like me.